View Single Post
Old 02-28-2012, 02:28 PM   #27 (permalink)
Diesel_Dave
Master EcoModder
 
Diesel_Dave's Avatar
 
Join Date: May 2011
Location: Indiana
Posts: 1,194

White Whale - '07 Dodge Ram 2500 ST Quad Cab 2wd, short bed
Team Cummins
90 day: 37.68 mpg (US)
Thanks: 112
Thanked 511 Times in 213 Posts
High compression ratio does improve fuel economy. The advantage of lower compression ratio is that power density improves, that is to say you can get more power out of the same displacement engine. If you look at diesel racing engines they'll have low compression ratio, as will some other applications were fuel economy is less important than power output. Higher compression ratio increases peak cylinder pressures, thus the reduced power density.
__________________
Diesel Dave

My version of energy storage is called "momentum".
My version of regenerative braking is called "bump starting".

1 Year Avg (Every Mile Traveled) = 47.8 mpg

BEST TANK: 2,009.6 mi on 35 gal (57.42 mpg): http://ecomodder.com/forum/showthrea...5-a-26259.html


  Reply With Quote